focal (3) curl_getdate.3.gz

NAME

       curl_getdate - Convert a date string to number of seconds

SYNOPSIS

       #include <curl/curl.h>

       time_t curl_getdate(char *datestring, time_t *now );

DESCRIPTION

       curl_getdate(3)  returns the number of seconds since the Epoch, January 1st 1970 00:00:00 in the UTC time
       zone, for the date and time that the datestring parameter specifies. The now parameter is not used,  pass
       a NULL there.

PARSING DATES AND TIMES

       A  "date"  is  a  string  containing  several  items  separated  by whitespace. The order of the items is
       immaterial.  A date string may contain many flavors of items:

       calendar date items
               Can be specified several ways. Month  names  can  only  be  three-letter  english  abbreviations,
               numbers  can  be  zero-prefixed  and  the  year  may  use  2 or 4 digits.  Examples: 06 Nov 1994,
               06-Nov-94 and Nov-94 6.

       time of the day items
               This string specifies the time on a given day. You must specify it with 6 digits with two colons:
               HH:MM:SS.  To  not  include  the  time  in a date string, will make the function assume 00:00:00.
               Example: 18:19:21.

       time zone items
               Specifies international time zone. There are a few acronyms supported, but in general you  should
               instead  use  the  specific relative time compared to UTC. Supported formats include: -1200, MST,
               +0100.

       day of the week items
               Specifies a day of the week. Days of the week  may  be  spelled  out  in  full  (using  english):
               `Sunday',  `Monday', etc or they may be abbreviated to their first three letters. This is usually
               not info that adds anything.

       pure numbers
               If a decimal number of the form YYYYMMDD appears, then YYYY is read as the year, MM as the  month
               number and DD as the day of the month, for the specified calendar date.

EXAMPLES

       Sun, 06 Nov 1994 08:49:37 GMT
       Sunday, 06-Nov-94 08:49:37 GMT
       Sun Nov  6 08:49:37 1994
       06 Nov 1994 08:49:37 GMT
       06-Nov-94 08:49:37 GMT
       Nov  6 08:49:37 1994
       06 Nov 1994 08:49:37
       06-Nov-94 08:49:37
       1994 Nov 6 08:49:37
       GMT 08:49:37 06-Nov-94 Sunday
       94 6 Nov 08:49:37
       1994 Nov 6
       06-Nov-94
       Sun Nov 6 94
       1994.Nov.6
       Sun/Nov/6/94/GMT
       Sun, 06 Nov 1994 08:49:37 CET
       06 Nov 1994 08:49:37 EST
       Sun, 12 Sep 2004 15:05:58 -0700
       Sat, 11 Sep 2004 21:32:11 +0200
       20040912 15:05:58 -0700
       20040911 +0200

STANDARDS

       This  parser  was  written to handle date formats specified in RFC 822 (including the update in RFC 1123)
       using time zone name or time zone delta and RFC 850 (obsoleted  by  RFC  1036)  and  ANSI  C's  asctime()
       format. These formats are the only ones RFC 7231 says HTTP applications may use.

RETURN VALUE

       This  function  returns  -1  when  it  fails to parse the date string. Otherwise it returns the number of
       seconds as described.

       On systems with a signed 32 bit time_t: if the year is larger than 2037 or less than 1903, this  function
       will return -1.

       On  systems  with  an  unsigned  32  bit  time_t: if the year is larger than 2106 or less than 1970, this
       function will return -1.

       On systems with 64 bit time_t: if the year is  less  than  1583,  this  function  will  return  -1.  (The
       Gregorian calendar was first introduced 1582 so no "real" dates in this way of doing dates existed before
       then.)

SEE ALSO

       curl_easy_escape(3), curl_easy_unescape(3), CURLOPT_TIMECONDITION(3), CURLOPT_TIMEVALUE(3)